* Revert "fix terminal attribution shim removal edge cases (#14187)"
This reverts 585dd6d3a9. Re-landed in the next commit without the host capability gate. Nothing shipped with it, so no migration constraint.
* rm git shim: neutralize stale wrappers without a host gate
Re-lands the cleanup half of #14187: pass-through tombstones for retained wrapper paths, env/PATH scrubbing at every spawn owner, and the retired setting drop.
Only writes tombstones when the legacy directory already exists, so a clean install no longer has it created. Leaves out the terminal.attribution-removed.v1 capability gate: the tombstone neutralizes each host locally, so refusing terminal create/split against older hosts denied service without adding cleanup.
* rm git shim: surface neutralization failures and fix rollback marker
Readiness review follow-ups: warn on each failed attempt and on give-up (was silent and undiagnosable); write a VERSION marker distinct from the retired shim's '7' so a rolled-back build rewrites its own wrappers; clear a captured ORCA_REAL_* path that no longer exists so the cmd wrapper's where.exe fallback can run; stop a locked temp file masking the real error. Adds retry-exhaustion coverage.
* rm git shim: pin the cmd fallback order and correct the give-up count
Round-2 review follow-ups: string-pin that a stale ORCA_REAL_* is cleared before the where.exe fallback, and count the initial attempt in the give-up warning so it agrees with the per-attempt line.
* rm git shim: keep the split-failure toast
The revert took a toast that #14187 added alongside the gate but which stands on its own: without it a failed remote split only reaches the console and the pane silently never appears. Also pins attempt ordinals in the retry-exhaustion test.
Brennan Benson
Neil
Jinwoo Hong
